Dental-crown-making machine



l'. NAVARRO M.

nENTAL cRowN MAKING MACHINE.

APPLICATION FILED DEC.4. 19|?.

1511161113@ July' 13, 1920.v

3 SHEElS-SHEEI I.

" Arromvfr Y i l l. NAVARRO M.

I DENTAL CROWN MAKING MACHINE.

APPLICATION HLED DEc.4. 1917.

3 SHEElS-SHEEI 2.

, 1 46,719. f Patented July 13,1920.

l fron/1ers l. NAVARRO M.

DENTAL CROWN MAKING MACHINE.

APPLICATION 'FILED 050.51917.

Patented July 13, 1920..

3 SHEETS-SHEE 3.

d(DC)@COCMDOQ ffl-52:55. @5.5i @Efgi iiNi'rEn srA'iEs PATENT' oFFicE.

IGNACIO NAVARRO iii/i., or CARACAS, VENEZUELA.' 1

EENTAL-CRCWN-MAKING MACHINE.v

specicaiionofnetterslaieni. rateiitefiauiy 13,1920.

App'iicaiion inea December 4, 191'?. serial No. 205,380.

To all whom t mag/'coni ,'r'n

Be it known that I, loNAoIo NAVARRO M., a citizen of Venezuela, and a resident of Caracas, Venezuela, have invented a new and Improved Dental-Crown-Makin'g Machine,

of which the following is a full7 clear, and exact description.

Among the principal object-s which the' arranged in accordance with the'present invention, the machine 'being disposed :for

.the manufacture of sheet metal blanksfrom which'crown cups are constructed Fig. 2 is an end elevation of the same;

Fig. 3 is a side elevation of Va portion of the machine showing the elements as arf yranged for the Yconifeision of the blanks.

above mentioned into crown cups from which the crowns are constructed, the inachine being vshown in open .position toreceive said'blanks; Y

Fig. 4 -is a side elevation of the same, showing the 'machine in close'dposition, the dotted lines inthis gure showing` the raised position of the head of thel machinek and.l parts connected therewith whenemployed as a press head;

Fig. '5 is aside elevation ofthemacliine showing the press head as equipped with a diefoi' forming the denture of the cro`wn; ,.l

' Fig. 6 is a detail view on anenlarged scale showing the dijsk-cuttingl dies and section of the press head, the section being taken as on perfected crown.

the line G-G in Fig. 1;

Fig. 7 is a vertical section of the parts shown in Fig. 6, the section being4 taken as on theline 7-7 in said Fig. 6;

Fig. Sis a cross section ofthe Vdisk-cutting dies, the section being taken asy on the line 8-8 in Fig. 7, and showing in conjunction with the dies, aplate arranged to be cut Y Fig.

line l-lt'in Fig. 5;

-used to plungers;

Fig. 19 is a. top plan view .of a supporting 9 is a detail View on anenlarged v'scale showing themachine arranged for the i manufacture of crown cups, the base ofthe machine being in section, the section Vbeing takenas on the line 94-9 in Fig. 3;

Fig. 10 is a vertical cross section of the elements arranged as in Fig. 3, thesection being taken as on the line l0-10in Fig-.13;

i Fig. 11 is a similar View showing the crown-cup making parts in closed position,

and the cup in position for delivery.

l F ig.12 is a topv plan View of the female die blockV for making the completed crown, the machine standards being shown in section,`the section being taken as on the line 124-12 in Fig. 5;

Fig. 13 isa face View of one of the sections-forming the die block, the View being taken Aas on the line 413-13 in Fig. 12,

shown insection;

Fig.. 141 isa detail View on an enlarged scale and in vertical section showing the die the clampingy screws in said Fig. 12 being block as 'loaded Vwith -a crown cup, and the die plate with thedies in working position` thereto, the section being taken'las on tlie Fig. 15 shows the die members closed; Fig. 16 is a cross section of the die block,

the section being taken yas on the line 16-16 y .in Fig. 12;

Fig. 17 is a cross section of the dieimem` bers and male-die-holding plate, the section` being taken as on the line 17-17 in Fig; 12;

.Fig. 1S is a Atop View of va filling plate* protect theV crown Ycup-"forming plate for the male' dies.;

Fig.20 -is la side viewof one ofthe disks "i from which the crown is made;VV l Fig. 2 1zsliows'the succeeding step wherein thev 'disk i's converted into a crown cup;

Fig. 22 `s hows 'a vsucceeding step wherein the crown cup is converted into adenture crown; ,i Y

Fig'. 23 isa vertical section'through the Description The machine shown in the drawings provides among other things for 'the manufac- 2' ture of a quantity of crowns such as shown Ain Fig. 22, simultaneously. Thestepsfollowing in the.operation` of the machine re- "sult in three distinct products:A The disks, one *ofwhich--is shown inV Fig-..270 of the drawings, cut''roin sheets ofmetal of approved, character; crown cups or fermore particularly in Figs. 12 to 15 inclusive thereof. v v

In Figs. 1 and 2 of the drawings, the ma chineV is shown as arranged for making the various disks from which the crowns are subsequently shaped.

The die head 31 as shown lbest in Figs. 6

and 7, is provided with a series of passages 32, the upper edges whereof are sharpened` to Voperate in conjunction with punches 33 mounted ,in an assembling plate 34 which is supported upon and lifted above a guide plate 35 by means of springs 36. As shown best in Fig. 7, the punches 33 areV graduated in length to extend beyond the plate 35 and into the passages 32i successively, thereby cutting the interposed metal sheet to form thedirsks 37 serially. This avoids thevvimposition of the maximum strain on the machine and on the feed screw and cross head 39 thereof. The assembling plate 34, the guide plate 35, and die head 31 ares'tructnrally united.V The plate 35 and head 31 are fixedlyY spaced apart, being rigidly held by bolts 40 on 'spacing washers 41, which provided a slit between' the plate 35 and the head 31 for the introduction of continuous metal strips 42.

The strips 42 are heldin position to be cntV by gage members 43, as shown best in Figs. n

6 and 8. 1

The disk-cutting mechanism above described is installed in service to be operated vupon by the power mechanism and removed therefrom when not employed in cutting the disks. To this end,the plate 35 and head 31 has van end-opening recess 44 at one endy of said plate and'head,.and a side-opening recess 4K5 at'the opposite end thereof. g Tlie'said recesses in servicehold standards 46 and rest on the bosses 47 extended from the b ase plate 4S. The upper ends of the standards 46,V are connected by the cross head 39.

lfVhen the disk-cutting mechanism -is placed in seri/iceftlie 'strips 42 are` fed, between the vplate 35 and the head 31above the passages 32 in the path of the punches 33. The attendant then engages the hand wheel 49 and rotates the screw 50 to lower the end of the, same for'forcing vthe shoe plate 51 upon `the assembling plate 34, to the end that the assembling plate34 and punches 33 con` nected therewith are forced downward, the

said ,punchesL passing successively through the metal strip 42, whichtlien drops through the passages 32 upon the bed plate 43.

As indicatedby the passages 32, as shownV inV Fig. 7 of the drawings, and by the tops of the various punches 33 as shown in Fig.

6 of the drawings, the disks are of different sizes, such as areV required to make openended cylindrical crown cups 52, as shown in Fig. 21 of the drawings.

lhen a snflicient supply of disks 37 has been thus obtained, the disk-cutting mechanisni is removed fromv its surface relation to the Apower mechanism andthe machineV is then adjusted for the next step, which is that resulting in the formation of the crown` cups 52.

The lirststep in preparing the mechanism 'i for the forming of the crown cups 52 after removing the disk-cutting mechanism, consists in removing the shoe plate `51. To this v end, cotter pins 53 arewithdrawn from-pins disposed prevent any subsequent movementV of the cup-shaping plate 55.

The cross head( 54 is slidably guided by vthe standards 46 and is provided with a series of plungers 59. The plungers 59, as shown best in Fig. 3 of the drawings,'vary in diameter, said plungers. corresponding with open-ended sockets 60 in the cup-` shaped plate 55. It will be noted that each plunger 59 is diminished inl its diameter relativeto thel sockets 60 with which each corresponds. The difference in the diameters between said plungers and their corre-V sponding sockets, isthe thickness of the metal from which the crown cups are to be formed. .Y

- As shown best in Figs. 10 and 1,1.of the drawings, the cup-shaping'plate 55 is provided adjacent each of the sockets 60, with a recess 61. The recesses 61 are provided to receive the disks 37, which are fed to the Vplate 55 when the cross head 54 is raised to the position as shown in Fig. 3. It will beV Y' observed by reference to Fi 11, that ,the

Vplnngers are longer thanV tje sockets 60.

The result of this construction is that when .the cross head 54 is depressed to engage the plate the'plungers59extend -beyond the j lower ends of the sockets 60 and deliver the cups 52 formed thereby when the cross head 54 and the accompanying plungers are lifted. i Y If it is desired to produce a crown` of greater length than ordinary, this is acf 12s complished by successively moving the coinpleted crowns produced in a larger socket to a'relat'ively smaller socket. The step-by-l step f action is advantageous in that. the

metal is not 'crowded to form the narrowv elongated cup to the extent that it would cup by a: single operation.

be should the endeavor be made to form this l/Vhen a sufficient number of'cups 52 have :been produced, .the machine'fis :re-arranged to finish the crowns '.62 shown in Fig. 22 of the drawings.' To .form the denture 63 in the crowns', aseries of malek striking dies64 are securely mounted in a die plate 65, as seen best in Figs.- 14 and 15. of the drawings.

,lift the plate from the position shown in :Fig 8 to that shown in Fig..5, the Across head 54is lowered-to engage the spacing plate.67,ifwl iich'is disposed on the platev 55.,

V-The hooks 56- are then vreleased .fromthe staples 58 and are swung to engage thepins 57 The plate 67 is thickenough to prevent the extent of the plungers 59 .beyond the lower opening of the sockets 60.` lhen the wheel 49 is now rotated, the cross head 54, plates 67 and 55 are lifted to permit the installation of the die plate 65.- Tlie die plate 65 is supported by cotter pins eX- tended through the supporting pins 68 with which the plate 55 is provided as shown best in Fig. 4 of the drawings.

As shown best in Fig. 19 of the drawings, the guide plate 65 is provided with a series of variously shaped'sockets 69 for receiving the Shanks 7() of the various striking dies 64. By this method care is taken to insure the correct placing of each striking male die 64 with reference to its corresponding female shaping die 71. The female shaping dies 71 are held in service in a die block 72 and rigidly clamped between side plates thereof. s A

As best shown in Figs. 12 to 17, inclusive, the block 72 is formed of two side plates. The plates are parted on themedial line of the block, each plate having a half socket 7 3 formed therein. From each half socket extends an end-opening channel 74. The channel 74 when joined form in the die block, vent holes 75, topermit the escape'of gas medium used for casting or forming the female die 71 under pressure. This is usually accomplished by lling the sockets v73 with some suitable plastic material, and then forcing the corresponding striking die 64 on the plastic mass. Plaster of Paris is usually employed though other suitable materials may be used.l Then the pattern thus formed is set, the die block is opened to permit the withdrawal of the pattern. From these patterns, metal diesare formed. They are placed in service position between the sides of the block 72, which is then closed by means of'clamping bolts 76 and wing nuts 77 therefor. As shown best in Fig. 12 of the drawings, the sides of the `plate 65v register. H f, l l block is placed in position, vthe cupsl 52 corresponding with the various sockets 7 3 are placed inthe said sockets and the wheel 49 is Vmanipulated to depress the -head l54, plate 65 and striking, dies` 64 block when in serviceencomp'ass the standards 46 with sufficient force .to hold Vthe same firmly in service position. The die blocks 72 are furnished with positioning .pins y78, with whichholes formedin the When the. .die

mounted therein, the said dies .64 entering the cups 52 to force the same into the' sockets '73. The descent of vthe cross head` 54 is arrested Lwhen the dies -64 compress firmly Ithe end,v of the .cup k52 to form the denture .63, and, if needed,to shape the side `walls converting thecups 52 into the perfectedcrowns 62. The crosshead 54 is then l raisedto furnish access to the dies 64, land the crowns 62 carried thereby. The said Olaz'ms.

. 1. A machine as characterized comprising a press having a base plate provided with standards, and a reciprocatinghead mounted to slide on said standards; a die block for holding denture forming female dies; a plurality of operatively united denture forming male dies serially arranged; andmeans for predetermining the operating position of ksaid denture forming dies with reference to the dies in said dieeblock, said means 'embodying a supporting plate'for said striking` dies having a detachable connection with the head and provided with a series of vari` ously shaped passages for holding the shanks` of said striking dies.

2. A machine as characterized comprising i a hand'press having a base plate; and a reciprocating head mounted in guided 'relation` to said base plate; a die block for holding a series of female shaping dies, said block being parted on the longitudinal vertical` plane for separating said block'on the medial plane; and means for holding said die block in operative. relation to -said reciprocatingV plungers, a cup shaping plate mounted to slide on the standards and having open;

ended sockets, and means for detachably sei a base, standards projecting from the base, a

c cross head slirdable on the standards and provided with plungers, means for operating thecross head, a cup-shaping plate slidable 0n Vthe standards and having open ended sockets, and hooks carried by the said plate and adapted to be engaged with the base or the cross head.

5. In a machine of the character described,

y'albase, standards projecting from the base,

a cross head slidable on the standards and vprovided With plungers, means for operating the cross head, an apertured plate' detachably secured to the cross head, an apertured spacing member between the said plate and crossy head, a die plate carrying dies and detachably secured to the apertured plate, and a die block carrying femaledies and mounted on the standards of the base.

6. Ina machine of the character'described, a base provided With standards', a cross head slidably mounted on the Standards, means for operating the cross head, a plate detachably secured'to the cross head,'avdie plate detachably secured to said plate, and a die block carrying the female dies and detachably mounted on the standards of the base.

suo

7. In a machine of the character described, Y

a base provided With standardS, a cross head slidably mounted on the standards, means foroperating the cross head, a male die plate carried by thecross head and provided with dies, a sectional female die blockv and means for securing the sections of the'die block together and the block on the rstandards of the' base. ,i y

IGNACIO NAVARRO M. 

